Pyrotechnic composition for producing yellow smoke



Patented Aug; 1, 1933 f r TBS ,UNITEJ 'PYBQTECHNIC PATE T; OFFI v1,920,254 Q 7 COMPOSITION FOR PRO- DUCING YELLOW SMOKE George U. Graft, Washington, DQC.

No Drawing.- Application January 18, 1933' 1 Serial No. 652,430 M 5 claims; (01. 52-24) '(Granted under the Act pr March 3,1883, as amended April 30, 1928; 370 0. G. 757) This invention relates to a pyrotechnic composition for producing yellowsmoke and has for" its object to provide a composition that will evolve an abundance of. deeply colored smoke of the col- 5 or specified. g

With the above and other objects in view, this invention consists in the construction, combination and arrangement of parts as will scribed more fully hereinafter." 7 r 10 I have found that the above mentioned object may be attained by mixing potassium bichromate,

magnesium and an oxygen-yieldingsalt of bis muth in suitable proportions. v V

One substance well adapted to produce yellow smoke is: potassium' bichromate fifijparts, .bis-

muth tetroxide parts, magnesium 14 parts; that is, the ingredients are substantially in the proportion 13: l:2, respectively. 7

Another substance that gives the same result 20 is:' potassium bichromate 65 parts, bismuth subnitrate 20 parts, and'magnesium 15 parts, the

, proportions having approximatelythe same re lation as above given.

The compositions specified gives off pufis of yel1owsmoke that are particularly adapted for use in daylightfireworks and various daylight signaling devices, though; the application of this invention is not limited to the purposes specified,

It is to be understood that the proportions 0 specified for the several ingredients represent the be dely in the proportions 13 :4:3.

- bismuthsubnitrate and magnesium, substantialthat strict adherence thereto is not essential, as good results are obtained even when they are varied within considerable limits,

The herein described invention maybe manufactured and used by or for the Government of the United States for governmental purposes without the payment of any royalty thereon. 7

I claim: I i v 1. A pyrotechnic composition for. producing yellowsmoke,comprising potassium bichromate 66 part's,:bismuth tetroxide 20 parts, and mag nesium 1-4 parts.

-2 A;pyrotechnic composition for-producing .yellow smoke, comprising {potassium bichromate 65 partsgbismuth subnitrate 20 parts, and magnesium 15 parts; V 3. IA pyrotechnic composition for producing f yellow smoke, comprising potassium 'bichromate,

bismuth tetroXideQand. magnesium, substantialefl 4. A pyrotechnic composition for producing yellow smoke, comprising potassiumbichromate,

ly in the proportions 13:423. a 5. A pyrotechnic composition for producing yellow smoke, comprising potassium bichromate, [an oxygen-yielding salt of bismuth and mag nesium substantially in the proportions of13z4z3, respectively. .Y

, i 7 s5 GEORGE U. GRAFF. 

